So on 21st May 2012 version 6 of nmap was released. Only issue is that they dont seem to release a deb package for it.
No big deal we’ll just have to build our own (tested on BT5r2 32+64bit)…
echo "deb http://security.ubuntu.com/ubuntu lucid-security main" >> /etc/apt/sources.list
apt-get install libssl-dev checkinstall
bzip2 -cd nmap-6.00.tar.bz2 | tar xvf -
#Fill in the details as you desire and you're done